Iron Isotope Biosignatures-Reference-Cited by-同舟云学术

Iron Isotope Biosignatures

Published:1999-09-17 Issue:5435 Volume:285 Page:1889-1892
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Beard Brian L.¹,Johnson Clark M.¹,Cox Lea²,Sun Henry²,Nealson Kenneth H.²,Aguilar Carmen³

Affiliation:

1. Department of Geology and Geophysics, University of Wisconsin-Madison, 1215 West Dayton Street, Madison, WI 53706, USA.

2. Jet Propulsion Laboratory, MS 183-301, 4800 Oak Grove Road, Pasadena, CA 91109–8009, USA.

3. Institute for Great Lakes Study, University of Wisconsin-Milwaukee, 600 East Greenfield Avenue, Milwaukee, WI 53204, USA.

Abstract

The 56 Fe/ 54 Fe of Fe-bearing phases precipitated in sedimentary environments varies by 2.5 per mil (δ 56 Fe values of +0.9 to −1.6 per mil). In contrast, the 56 Fe/ 54 Fe of Fe-bearing phases in igneous rocks from Earth and the moon does not vary measurably (δ 56 Fe = 0.0 ± 0.3 per mil). Experiments with dissimilatory Fe-reducing bacteria of the genus Shewanella algae grown on a ferrihydrite substrate indicate that the δ 56 Fe of ferrous Fe in solution is isotopically lighter than the ferrihydrite substrate by 1.3 per mil. Therefore, the range in δ 56 Fe values of sedimentary rocks may reflect biogenic fractionation, and the isotopic composition of Fe may be used to trace the distribution of microorganisms in modern and ancient Earth.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference20 articles.

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